• into, in, or on a ship, train, or airplane [adv]
  • on board [adv]
  • base
  • on a ship, train, etc.
  • on
  • (as a warning to passengers entering or planning to enter a train, bus, boat, etc., just before starting) Everyone get on!
  • alongside
  • or into a group, association, or organization her second promotion since coming aboard